Scientists estimate that a certain meteorite had a mass of about 1.4 10^8 kg (around 150,000 tons) and was traveling at nearly 12 km/s when it struck the earth. About how long would it take a standard coal fired power plant which generates about 1 billion joules per second to generate the same amount of kinetic energy as the meteorite when it hit the ground?

3 years
12 days
7.6 years
116 days

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

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